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(11)

EP 3 472 585 A1

(12)

(43) Date of publication: 24.04.2019 Bulletin 2019/17 (21) Application number: 17814374.9 (22) Date of filing: 20.06.2017

(51) International Patent Classification (IPC):  G01L 5/00(2006.01) G01L 1/04(2006.01) E21D 21/02(2006.01) (86) International application number: PCT/CA2017/050752 (87) International publication number: WO 2017/219134 (28.12.2017 Gazette 2017/52)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 21.06.2016 US 201662352827 P (71) Applicant: Alert Technologies Inc. Sault Ste. Marie, Ontario P6A 1X3 (CA)	(72) Inventors: GOTMALM, Christer deceased (CA) MANKOWSKI, Josef Robert London Ontario N6C 1B7 (CA) (74) Representative: DTS Patent- und Rechtsanwälte Schnekenbühl und Partner mbB  Marstallstrasse 8 80539 München 80539 München (DE)